[PATCH v3 net-next 09/10] net: hns3: Setting for fc_mode and dcb enable flag in TM module

[Yunsheng Lin]

After the DCB feature is supported, fc_mode and dcb enable flag
must be set according to the DCB parameter.

Signed-off-by: Yunsheng Lin <linyunsh...@huawei.com>
---
 .../net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c  | 34 +++++++++++++++++++---
 1 file changed, 30 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c 
b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c
index 8295684..359ee67 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c
@@ -486,7 +486,11 @@ static void hclge_tm_tc_info_init(struct hclge_dev *hdev)
                hdev->tm_info.prio_tc[i] =
                        (i >= hdev->tm_info.num_tc) ? 0 : i;
 
-       hdev->flag &= ~HCLGE_FLAG_DCB_ENABLE;
+       /* DCB is enabled if we have more than 1 TC */
+       if (hdev->tm_info.num_tc > 1)
+               hdev->flag |= HCLGE_FLAG_DCB_ENABLE;
+       else
+               hdev->flag &= ~HCLGE_FLAG_DCB_ENABLE;
 }
 
 static void hclge_tm_pg_info_init(struct hclge_dev *hdev)
@@ -512,6 +516,24 @@ static void hclge_tm_pg_info_init(struct hclge_dev *hdev)
        }
 }
 
+static void hclge_pfc_info_init(struct hclge_dev *hdev)
+{
+       if (!(hdev->flag & HCLGE_FLAG_DCB_ENABLE)) {
+               if (hdev->fc_mode_last_time == HCLGE_FC_PFC)
+                       dev_warn(&hdev->pdev->dev,
+                                "DCB is disable, but last mode is FC_PFC\n");
+
+               hdev->tm_info.fc_mode = hdev->fc_mode_last_time;
+       } else if (hdev->tm_info.fc_mode != HCLGE_FC_PFC) {
+               /* fc_mode_last_time record the last fc_mode when
+                * DCB is enabled, so that fc_mode can be set to
+                * the correct value when DCB is disabled.
+                */
+               hdev->fc_mode_last_time = hdev->tm_info.fc_mode;
+               hdev->tm_info.fc_mode = HCLGE_FC_PFC;
+       }
+}
+
 static int hclge_tm_schd_info_init(struct hclge_dev *hdev)
 {
        if ((hdev->tx_sch_mode != HCLGE_FLAG_TC_BASE_SCH_MODE) &&
@@ -524,8 +546,7 @@ static int hclge_tm_schd_info_init(struct hclge_dev *hdev)
 
        hclge_tm_vport_info_update(hdev);
 
-       hdev->tm_info.fc_mode = HCLGE_FC_NONE;
-       hdev->fc_mode_last_time = hdev->tm_info.fc_mode;
+       hclge_pfc_info_init(hdev);
 
        return 0;
 }
@@ -1158,8 +1179,13 @@ int hclge_tm_init_hw(struct hclge_dev *hdev)
 
 int hclge_tm_schd_init(struct hclge_dev *hdev)
 {
-       int ret = hclge_tm_schd_info_init(hdev);
+       int ret;
+
+       /* fc_mode is HCLGE_FC_FULL on reset */
+       hdev->tm_info.fc_mode = HCLGE_FC_FULL;
+       hdev->fc_mode_last_time = hdev->tm_info.fc_mode;
 
+       ret = hclge_tm_schd_info_init(hdev);
        if (ret)
                return ret;
 
-- 
1.9.1